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update musl libc test to fix "cross" compilation on glibc system #19352

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update musl libc test to fix "cross" compilation on glibc system #19352

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cfec809
update musl libc test to fix "cross" compilation on glibc system
henderkes Aug 3, 2025
a74f812
int main(void)
henderkes Aug 3, 2025
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22 changes: 15 additions & 7 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -236,13 +236,21 @@ esac

dnl Detect musl libc
AC_MSG_CHECKING([whether we are using musl libc])
if command -v ldd >/dev/null && ldd --version 2>&1 | grep ^musl >/dev/null 2>&1
then
AC_MSG_RESULT([yes])
AC_DEFINE([__MUSL__], [1], [Define to 1 when using musl libc.])
else
AC_MSG_RESULT([no])
fi
AC_COMPILE_IFELSE(
[AC_LANG_SOURCE([[
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <features.h>
#ifdef __USE_GNU
#error Not using musl
#endif
int main(void) { return 0; }
]])],
[AC_MSG_RESULT([yes])
AC_DEFINE([__MUSL__], [1], [Define to 1 when using musl libc.])],
[AC_MSG_RESULT([no])]
)

dnl Add _GNU_SOURCE compile definition because the php_config.h with definitions
dnl by AC_USE_SYSTEM_EXTENSIONS might be included after the system headers which
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