Description:
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I need PostgreSQL support and therefore I frequently build a custom PHP on my Mac. This time, I built PHP 5.6.12, using the steps below. On Mac OS X, the default compiler is clang. And clang found a hell lot of warnings, many of which seem to be real issues and not clang peculiarities. For example, I saw several like this one:

/Users/rolf/Installation/php-5.6.12/ext/date/php_date.c:2254:6: warning: absolute value function 'abs' given an argument of type 'long long' but has parameter of type 'int' which may cause truncation of value

If the incriminated code is used for datetime calculatios with input values after the year 2038, then it would fail miserably.

Yet another example:

/Users/rolf/Installation/php-5.6.12/ext/pdo/pdo_stmt.c:469:19: warning: comparison of unsigned expression < 0 is always false

The compilation usually bails out with the following error:

/Users/rolf/Installation/php-5.6.12/ext/sqlite3/libsqlite/sqlite3.c:23512:3: error: SQLite will not work correctly with the -ffast-math option of GCC.
# error SQLite will not work correctly with the -ffast-math option of GCC.

I usually replace that error declaration in sqlite3.c with a warning one, because clang is not GCC and -ffast-math takes NOT part in the compiler flags.


My Steps for building PHP on Mac OS X follow:

$ cd ~/Installation
$ export CFLAGS="-Ofast -g0 -Wno-deprecated-declarations"
$ curl -L http://br1.php.net/get/php-5.6.12.tar.bz2/from/this/mirror -o php-5.6.12.tar.bz2
$ tar -oxjf php-5.6.12.tar.bz2
$ cd php-5.6.12

$ sed -e "s/# error SQLite will not work correctly with the \-ffast\-math option of GCC./# warning SQLite will not work correctly with the \-ffast\-math option of GCC./" -i "" ext/sqlite3/libsqlite/sqlite3.c

$ ./configure --prefix=/usr/local/php5 --with-apxs2=/usr/sbin/apxs --with-ldap=/usr --with-kerberos=/usr --enable-cli --with-zlib=/usr --enable-exif --enable-ftp --enable-mbstring --enable-mbregex --enable-dba --enable-sockets --with-curl=/usr --with-config-file-path=/etc --sysconfdir=/private/etc --with-pgsql=/usr/local/pgsql --with-mysql-sock=/var/mysql/mysql.sock --with-mysql=mysqlnd --with-openssl=/usr --with-xmlrpc --with-xsl=/usr --with-iconv=/usr

$make | tee ../Warnings-php-5.6.12.txt


You can download the file "Warnings-php-5.6.12.txt" on "http://blog.obsigna.net/downloads/Warnings-php-5.6.12.txt". I will remove it in 30 days.

Best regards

Rolf