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bpo-46602: Do not append conftest.c (GH-31062)
The heredoc creation statements use >> to append conftest.c. This can cause tricky build issues if the file is not correctly removed prior to its name being reused (such name is reused several times for different contextual tests during the build). One such result from appending may cause #include <ac_nonexistent.h> to persist when testing to acquire PLATFORM_TRIPLET. This can then lead to downstream issues concerning SOABI.
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0611eafc70
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Tidied up configure.ac so that conftest.c is truncated rather than appended. This assists in the case where the 'rm' of conftest.c fails to happen between tests. Downstream issues such as a clobbered SOABI can result.
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@ -5942,7 +5942,7 @@ fi
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for the platform triplet based on compiler characteristics" >&5
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$as_echo_n "checking for the platform triplet based on compiler characteristics... " >&6; }
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cat >> conftest.c <<EOF
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cat > conftest.c <<EOF
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#undef bfin
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#undef cris
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#undef fr30
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@ -6169,7 +6169,7 @@ $as_echo "$ac_cv_wl_no_as_needed" >&6; }
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for the Android API level" >&5
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$as_echo_n "checking for the Android API level... " >&6; }
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cat >> conftest.c <<EOF
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cat > conftest.c <<EOF
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#ifdef __ANDROID__
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android_api = __ANDROID_API__
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arm_arch = __ARM_ARCH
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@ -833,7 +833,7 @@ fi
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AC_MSG_CHECKING([for the platform triplet based on compiler characteristics])
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cat >> conftest.c <<EOF
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cat > conftest.c <<EOF
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#undef bfin
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#undef cris
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#undef fr30
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@ -1028,7 +1028,7 @@ AC_CACHE_CHECK([for -Wl,--no-as-needed], [ac_cv_wl_no_as_needed], [
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AC_SUBST(NO_AS_NEEDED)
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AC_MSG_CHECKING([for the Android API level])
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cat >> conftest.c <<EOF
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cat > conftest.c <<EOF
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#ifdef __ANDROID__
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android_api = __ANDROID_API__
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arm_arch = __ARM_ARCH
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