8000 Enabling cxx interop on Arch with GCC 15 causes lots of errors · Issue #81774 · swiftlang/swift · GitHub
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Open
gonsolo opened this issue May 26, 2025 · 3 comments
Open

Enabling cxx interop on Arch with GCC 15 causes lots of errors #81774

gonsolo opened this issue May 26, 2025 · 3 comments
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@egorzhdan
Labels
bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. c++ interop Feature: Interoperability with C++

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@gonsolo
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gonsolo commented May 26, 2025

Description

Enabling cxx interop on a simple example generates lots of errors with latest GCC on Arch Linux:

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:100:3: error: redefinition of 'acos'
  98 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
  99 |   inline _GLIBCXX_CONSTEXPR float
 100 |   acos(float __x)
     |   |- error: redefinition of 'acos'
     |   `- note: previous definition is here
 101 |   { return __builtin_acosf(__x); }
 102 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:104:3: error: redefinition of 'acos'
 102 | 
 103 |   inline _GLIBCXX_CONSTEXPR long double
 104 |   acos(long double __x)
     |   |- error: redefinition of 'acos'
     |   `- note: previous definition is here
 105 |   { return __builtin_acosl(__x); }
 106 | #endif

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:112:5: error: redefinition of 'acos'
 110 |     typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value, 
 111 |                                     double>::__type
 112 |     acos(_Tp __x)
     |     |- error: redefinition of 'acos'
     |     `- note: previous definition is here
 113 |     { return __builtin_acos(__x); }
 114 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:119:3: error: redefinition of 'asin'
 117 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
 118 |   inline _GLIBCXX_CONSTEXPR float
 119 |   asin(float __x)
     |   |- error: redefinition of 'asin'
     |   `- note: previous definition is here
 120 |   { return __builtin_asinf(__x); }
 121 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:123:3: error: redefinition of 'asin'
 121 | 
 122 |   inline _GLIBCXX_CONSTEXPR long double
 123 |   asin(long double __x)
     |   |- error: redefinition of 'asin'
     |   `- note: previous definition is here
 124 |   { return __builtin_asinl(__x); }
 125 | #endif

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:131:5: error: redefinition of 'asin'
 129 |     typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value,
 130 |                                     double>::__type
 131 |     asin(_Tp __x)
     |     |- error: redefinition of 'asin'
     |     `- note: previous definition is here
 132 |     { return __builtin_asin(__x); }
 133 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:138:3: error: redefinition of 'atan'
 136 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
 137 |   inline _GLIBCXX_CONSTEXPR float
 138 |   atan(float __x)
     |   |- error: redefinition of 'atan'
     |   `- note: previous definition is here
 139 |   { return __builtin_atanf(__x); }
 140 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:142:3: error: redefinition of 'atan'
 140 | 
 141 |   inline _GLIBCXX_CONSTEXPR long double
 142 |   atan(long double __x)
     |   |- error: redefinition of 'atan'
     |   `- note: previous definition is here
 143 |   { return __builtin_atanl(__x); }
 144 | #endif

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:150:5: error: redefinition of 'atan'
 148 |     typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value,
 149 |                                     double>::__type
 150 |     atan(_Tp __x)
     |     |- error: redefinition of 'atan'
     |     `- note: previous definition is here
 151 |     { return __builtin_atan(__x); }
 152 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:157:3: error: redefinition of 'atan2'
 155 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
 156 |   inline _GLIBCXX_CONSTEXPR float
 157 |   atan2(float __y, float __x)
     |   |- error: redefinition of 'atan2'
     |   `- note: previous definition is here
 158 |   { return __builtin_atan2f(__y, __x); }
 159 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:161:3: error: redefinition of 'atan2'
 159 | 
 160 |   inline _GLIBCXX_CONSTEXPR long double
 161 |   atan2(long double __y, long double __x)
     |   |- error: redefinition of 'atan2'
     |   `- note: previous definition is here
 162 |   { return __builtin_atan2l(__y, __x); }
 163 | #endif

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:169:3: error: redefinition of 'ceil'
 167 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
 168 |   inline _GLIBCXX_CONSTEXPR float
 169 |   ceil(float __x)
     |   |- error: redefinition of 'ceil'
     |   `- note: previous definition is here
 170 |   { return __builtin_ceilf(__x); }
 171 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:173:3: error: redefinition of 'ceil'
 171 | 
 172 |   inline _GLIBCXX_CONSTEXPR long double
 173 |   ceil(long double __x)
     |   |- error: redefinition of 'ceil'
     |   `- note: previous definition is here
 174 |   { return __builtin_ceill(__x); }
 175 | #endif

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in fil
8000
e included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:181:5: error: redefinition of 'ceil'
 179 |     typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value, 
 180 |                                     double>::__type
 181 |     ceil(_Tp __x)
     |     |- error: redefinition of 'ceil'
     |     `- note: previous definition is here
 182 |     { return __builtin_ceil(__x); }
 183 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:188:3: error: redefinition of 'cos'
 186 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
 187 |   inline _GLIBCXX_CONSTEXPR float
 188 |   cos(float __x)
     |   |- error: redefinition of 'cos'
     |   `- note: previous definition is here
 189 |   { return __builtin_cosf(__x); }
 190 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:192:3: error: redefinition of 'cos'
 190 | 
 191 |   inline _GLIBCXX_CONSTEXPR long double
 192 |   cos(long double __x)
     |   |- error: redefinition of 'cos'
     |   `- note: previous definition is here
 193 |   { return __builtin_cosl(__x); }
 194 | #endif

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:200:5: error: redefinition of 'cos'
 198 |     typename __gnu_cxx::__enable_if<__is_integer<_Tp>::__value,
 199 |                                     double>::__type
 200 |     cos(_Tp __x)
     |     |- error: redefinition of 'cos'
     |     `- note: previous definition is here
 201 |     { return __builtin_cos(__x); }
 202 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:207:3: error: redefinition of 'cosh'
 205 | #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
 206 |   inline _GLIBCXX_CONSTEXPR float
 207 |   cosh(float __x)
     |   |- error: redefinition of 'cosh'
     |   `- note: previous definition is here
 208 |   { return __builtin_coshf(__x); }
 209 | 

<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "_FoundationCShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 

/usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
15 | 
16 | #include "_CShimsTargetConditionals.h"
17 | #include "_CStdlib.h"
   |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_FoundationCShims.h:17:
18 | #include "CFUniCharBitmapData.inc.h"
19 | #include "CFUniCharBitmapData.h"

/usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:10: note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 53 | 
 54 | #if __has_include(<math.h>)
 55 | #include <math.h>
    |          `- note: in file included from /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h:55:
 56 | #endif
 57 | 

/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:11: note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 34 | #define _GLIBCXX_MATH_H 1
 35 | 
 36 | # include <cmath>
    |           `- note: in file included from /usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/math.h:36:
 37 | 
 38 | using std::abs;

<unknown>:0: error: too many errors emitted, stopping now
<unknown>:0: error: could not build C module '_FoundationCShims'
/usr/lib64/gcc/x86_64-pc-linux-gnu/15.1.1/../../../../include/c++/15.1.1/cmath:211:3: error: redefinition of 'cosh'
 209 | 
 210 |   inline _GLIBCXX_CONSTEXPR long double
 211 |   cosh(long double __x)
     |   |- error: redefinition of 'cosh'
     |   `- note: previous definition is here
 212 |   { return __builtin_coshl(__x); }
 213 | #endif
make: *** [Makefile:3: all] Fehler 1

Reproduction



Expected behavior


Just compile without errors.


Environment


Swift version 6.1.1 (swift-6.1.1-RELEASE)

Target: x86_64-unknown-linux-gnu


Additional information


No response

      		
    

      
  





        



            
            

              
            

        

      


      
    








      

    



      

  
            

    

      
    

    


      

          @gonsolo
gonsolo




            added
      

  bug

  A deviation from expected or documented behavior. Also: expected but undesirable behavior.

      

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      May 26, 2025

    

  



    

    

      
    

    


      

          @egorzhdan
egorzhdan




              self-assigned this


      May 30, 2025

    

  



    

    

      
    

    


      

          @egorzhdan
egorzhdan




            added
      

  c++ interop

  Feature: Interoperability with C++

    and removed
      

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      May 30, 2025

    

  








      

  
      



  

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Seems like a modularization issue on the intersection of CoreFoundation and libstdc++.

      		
    

  





        


            

            
            

              
            

        

      


      

            
  
  

    
  
    
    

  

  

  


    












      

  
      



  

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            gonsolo
  

      

      

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        May 30, 2025


      
    


  




      


        


  
    

      
          
This helps:


+ #if 0
#if __has_include(<math.h>)
#endif
+ #endif



In /usr/lib/swift/lib/swift/_FoundationCShims/_CStdlib.h +55

      		
    

  





        


            

            
            

              
            

        

      


      

            
  
  

    
  
    
    

  

  

  


    












      

  
      



  

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        Jun 1, 2025


      
    


  




      


        


  
    

      
          
It should be noted that math related functions still work:


let x = sin(3.0)


      		
    

  





        


            

            
            

              
            

        

      


      

            
  
  

    
  
    
    

  

  

  


    
















  
  

    

      

  





  




  
  

              

  
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    bug

  A deviation from expected or documented behavior. Also: expected but undesirable behavior.
  

    c++ interop

  Feature: Interoperability with C++








      

  

    

        

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