Bug #78750 [NEW]: configure assumes yacc and re2c work

From: php-bugs-2019 at ryandesign dot com Operating system: macOS PHP version: 7.4.0RC4 Package: *Compile Issues Bug Type: Bug Bug description:configure assumes yacc and re2c work Description: ------------ The configure script was modified in PHP 7.4 to test for the bison and re2c version. But the code to do so assumes that the program that it found responds to the --version flag and outputs a version number. If the program is found (or if the user specifies which program to use with the YACC or RE2C environment variables) but the output from the program is empty or doesn't include the version number, then the configure script inadvertently outputs all of its variables and functions. For years, with PHP 7.3.x and earlier, I've been configuring PHP with the environment variables LEX=true RE2C=true YACC=true. I did this to ensure that the build system did not regenerate the parsers, even if the right versions of lex, re2c or bison were installed; I could not find any other way to tell the build system not to do that. Now, with PHP 7.4, that doesn't work anymore, or maybe it does work, but it produces tons of undesired output in the process. This is because the configure script runs `$YACC --version 2> /dev/null | grep 'GNU Bison' | cut -d ' ' -f 4 | tr -d a-z`, assigns that to the variable php_bison_version, saves IFS, sets IFS to ".", and runs `set $php_bison_version`. If $php_bison_version is not empty, this sets the positional parameters. But if $php_bison_version is empty, it outputs all variables and functions. And similarly with $RE2C. https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html > If no options or arguments are supplied, set displays the names and values of all > shell variables and functions Test script: --------------- YACC=true ./configure Expected result: ---------------- [snip] checking for bison... true checking for bison version... unknown [snip] Actual result: -------------- [snip] checking for bison... true checking for bison version... AWK=gawk BASH=/bin/sh BASH_ARGC=([0]="1") BASH_ARGV=([0]="--no-reexec") BASH_LINENO=([0]="0") BASH_SOURCE=([0]="./configure") BASH_VERSINFO=([0]="3" [1]="2" [2]="57" [3]="1" [4]="release" [5]="x86_64-apple-darwin17") BASH_VERSION='3.2.57(1)-release' CC=cc CFLAGS='-g -O2' COLORFGBG='15;0' COLORTERM=truecolor CONFIGURE_ARGS= CONFIGURE_COMMAND=' '\''./configure'\'' ' [snip] val= var=CXX verbose= x_includes=NONE x_libraries=NONE expr: not a decimal number: 'dummy' [snip] -- Edit bug report at https://bugs.php.net/bug.php?id=78750&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78750&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78750&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78750&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78750&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78750&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78750&r=support Expected behavior: https://bugs.php.net/fix.php?id=78750&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78750&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78750&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78750&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78750&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78750&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78750&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78750&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78750&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78750&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78750&r=mysqlcfg