[PATCH] configure: Add sanity checking for environment variables

[Tomi Ollila]

On Wed, May 20 2015, Tomi Ollila <tomi.ollila at iki.fi> wrote:

> On Wed, May 20 2015, David Bremner <david at tethera.net> wrote:
>
>> Passing in environment variables incompatible with the compiler may
>> cause other parts of the configure script to fail in hard to
>> understand ways, so we abort early.
>> ---
>>
>> meh, the previous version was borken by lazy evaluation of CXXFLAGS
>> using make syntax. Better suggestions for how to do this?
>>
>>  configure | 31 +++++++++++++++++++++++++++++--
>>  1 file changed, 29 insertions(+), 2 deletions(-)
>>
>> diff --git a/configure b/configure
>> index 4af7ba9..650b976 100755
>> --- a/configure
>> +++ b/configure
>> @@ -269,6 +269,35 @@ dependencies are available:
>>  EOF
>>  
>>  errors=0
>> +printf "int main(void){return 0;}\n" > minimal.c
>> +
>> +printf "Sanity checking C compilation environment... "
>> +if ${CC} ${CFLAGS} ${CPPFLAGS}  minimal.c ${LDFLAGS} -o minimal > /dev/null 2>&1
>
> still 2 spaces  ----------------^
>
>> +then
>> +    printf "OK.\n"
>> +else
>> +    printf "Fail.\n"
>> +    errors=$((errors + 1))
>> +fi
>> +
>> +printf "Sanity checking C++ compilation environment... "
>> +if ${CXX} ${CXXFLAGS_for_sh} ${CPPFLAGS} minimal.c ${LDFLAGS} -o minimal > /dev/null 2>&1
>
> ${CXXFLAGS:-$CFLAGS} ?

of course not... I did not find any definition for CXXFLAGS_for_sh....
... so

case $CXXFLAGS 
	in *'(CFLAGS)'*) CXXFLAGS_for_sh=$CFLAGS 
	;; *) CXXFLAGS_for_sh=CXXFLAGS
esac


>
>> +then
>> +    printf "OK.\n"
>> +else
>> +    printf "Fail.\n"
>> +    errors=$((errors + 1))
>> +fi
>> +
>> +if [ $errors -gt 0 ]; then
>> +    cat <<EOF
>> +*** Error: Initial sanity checking of environment failed.  Please try
>> +running configure in a clean environment, and if the problem persists,
>> +report a bug.
>> +EOF
>> +    rm -f minimal minimal.c
>> +    exit 1
>> +fi
>>  
>>  if pkg-config --version > /dev/null 2>&1; then
>>      have_pkg_config=1
>> @@ -690,8 +719,6 @@ else
>>  fi
>>  rm -f compat/check_asctime
>>  
>> -printf "int main(void){return 0;}\n" > minimal.c
>> -
>>  printf "Checking for rpath support... "
>>  if ${CC} -Wl,--enable-new-dtags -Wl,-rpath,/tmp/ -o minimal minimal.c >/dev/null 2>&1
>>  then
>> -- 
>> 2.1.4
>>
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